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If this is all the information you have, then the question is asking you to reaarange the equation so that the variable "a" is by itself. If we knew that x and y were, then we would get an actual number. So to start we have your equation:
5x + y
So this question asks how many outfits (consisting of one item of each of the five groups) can we make without repeating. To best explain this question, lets simplify it for a moment and say that Laura wants to know the combinations of only the 3 jackets,
2 shoes, and belt she can wear without...